<?php

/**
 * Title         : Aqua Resizer
 * Description   : Resizes WordPress images on the fly
 * Version       : 1.1.7
 * Author        : Syamil MJ
 * Author URI    : http://aquagraphite.com
 * License       : WTFPL - http://sam.zoy.org/wtfpl/
 * Documentation : https://github.com/sy4mil/Aqua-Resizer/
 *
 * @param string  $url    - (required) must be uploaded using wp media uploader
 * @param int     $width  - (required)
 * @param int     $height - (optional)
 * @param bool    $crop   - (optional) default to soft crop
 * @param bool    $single - (optional) returns an array if false
 * @uses  wp_upload_dir()
 * @uses  image_resize_dimensions() | image_resize()
 * @uses  wp_get_image_editor()
 *
 * @return str|array
 */

function aq_resize( $url, $width = null, $height = null, $crop = null, $single = true, $upscale = false ) {

	// Validate inputs.
	if ( ! $url || ( ! $width && ! $height ) ) return false;

	// Caipt'n, ready to hook.
	if ( true === $upscale ) add_filter( 'image_resize_dimensions', 'aq_upscale', 10, 6 );

	// Define upload path & dir.
	$upload_info = wp_upload_dir();
	$upload_dir = $upload_info['basedir'];
	$upload_url = $upload_info['baseurl'];

	$http_prefix = "http://";
	$https_prefix = "https://";

	/* if the $url scheme differs from $upload_url scheme, make them match 
	   if the schemes differe, images don't show up. */
	if(!strncmp($url,$https_prefix,strlen($https_prefix))){ //if url begins with https:// make $upload_url begin with https:// as well
		$upload_url = str_replace($http_prefix,$https_prefix,$upload_url);
	}
	elseif(!strncmp($url,$http_prefix,strlen($http_prefix))){ //if url begins with http:// make $upload_url begin with http:// as well
		$upload_url = str_replace($https_prefix,$http_prefix,$upload_url);		
	}


	// Check if $img_url is local.
	if ( false === strpos( $url, $upload_url ) ) return false;

	// Define path of image.
	$rel_path = str_replace( $upload_url, '', $url );
	$img_path = $upload_dir . $rel_path;

	// Check if img path exists, and is an image indeed.
	if ( ! file_exists( $img_path ) or ! getimagesize( $img_path ) ) return false;

	// Get image info.
	$info = pathinfo( $img_path );
	$ext = $info['extension'];
	list( $orig_w, $orig_h ) = getimagesize( $img_path );

	// Get image size after cropping.
	$dims = image_resize_dimensions( $orig_w, $orig_h, $width, $height, $crop );
	$dst_w = $dims[4];
	$dst_h = $dims[5];

	// Return the original image only if it exactly fits the needed measures.
	if ( ! $dims && ( ( ( null === $height && $orig_w == $width ) xor ( null === $width && $orig_h == $height ) ) xor ( $height == $orig_h && $width == $orig_w ) ) ) {
		$img_url = $url;
		$dst_w = $orig_w;
		$dst_h = $orig_h;
	} else {
		// Use this to check if cropped image already exists, so we can return that instead.
		$suffix = "{$dst_w}x{$dst_h}";
		$dst_rel_path = str_replace( '.' . $ext, '', $rel_path );
		$destfilename = "{$upload_dir}{$dst_rel_path}-{$suffix}.{$ext}";

		if ( ! $dims || ( true == $crop && false == $upscale && ( $dst_w < $width || $dst_h < $height ) ) ) {
			// Can't resize, so return false saying that the action to do could not be processed as planned.
			return false;
		}
		// Else check if cache exists.
		elseif ( file_exists( $destfilename ) && getimagesize( $destfilename ) ) {
			$img_url = "{$upload_url}{$dst_rel_path}-{$suffix}.{$ext}";
		}
		// Else, we resize the image and return the new resized image url.
		else {

			// Note: This pre-3.5 fallback check will edited out in subsequent version.
			if ( function_exists( 'wp_get_image_editor' ) ) {

				$editor = wp_get_image_editor( $img_path );

				if ( is_wp_error( $editor ) || is_wp_error( $editor->resize( $width, $height, $crop ) ) )
					return false;

				$resized_file = $editor->save();

				if ( ! is_wp_error( $resized_file ) ) {
					$resized_rel_path = str_replace( $upload_dir, '', $resized_file['path'] );
					$img_url = $upload_url . $resized_rel_path;
				} else {
					return false;
				}

			} else {

				$resized_img_path = image_resize( $img_path, $width, $height, $crop ); // Fallback foo.
				if ( ! is_wp_error( $resized_img_path ) ) {
					$resized_rel_path = str_replace( $upload_dir, '', $resized_img_path );
					$img_url = $upload_url . $resized_rel_path;
				} else {
					return false;
				}

			}

		}
	}

	// Okay, leave the ship.
	if ( true === $upscale ) remove_filter( 'image_resize_dimensions', 'aq_upscale' );

	// Return the output.
	if ( $single ) {
		// str return.
		$image = $img_url;
	} else {
		// array return.
		$image = array (
			0 => $img_url,
			1 => $dst_w,
			2 => $dst_h
		);
	}

	return $image;
}


function aq_upscale( $default, $orig_w, $orig_h, $dest_w, $dest_h, $crop ) {
	if ( ! $crop ) return null; // Let the wordpress default function handle this.

	// Here is the point we allow to use larger image size than the original one.
	$aspect_ratio = $orig_w / $orig_h;
	$new_w = $dest_w;
	$new_h = $dest_h;

	if ( ! $new_w ) {
		$new_w = intval( $new_h * $aspect_ratio );
	}

	if ( ! $new_h ) {
		$new_h = intval( $new_w / $aspect_ratio );
	}

	$size_ratio = max( $new_w / $orig_w, $new_h / $orig_h );

	$crop_w = round( $new_w / $size_ratio );
	$crop_h = round( $new_h / $size_ratio );

	$s_x = floor( ( $orig_w - $crop_w ) / 2 );
	$s_y = floor( ( $orig_h - $crop_h ) / 2 );

	return array( 0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h );
}